Painting-booth apparatus



3. A. PAASCHE. v PAINTING BOOTH APPARATUS.

APPLICATION FILED JULY 5.1917.

Patented June 6, 1922,.

5 SHEETSSH EET 1.

I I I 9 W 1? M F J. A. PAASCHE.

PAINTING BOOTH APPARATUS.

APPLICATION FILED JULY 5.1911.

Patented June 6, 1922.

5 SHEETS$HEET 2.

1'. A. PAASC HE PAINTING BOOTHAPPARA TUS.

APPLICATION FILED JULY 5| 1917.

Patented June 6, 1922;

5 SHEETS-SHEET 3.

1. A. PA-ASCHE.

PAINTING BOOIH APPARATUS.

APPLICATION FILED JULY 5,1917. I

Patented June 6, 1922.

5 SHEETSSHEET 5- JENS A. PAASCHE, OF CHICAGO. ILLINOIS.

PAINTING-BOOTH APPARATUS.

Application filed July 5,

T 0 all whom it may concern Be it known that I. JENS A. PAASCHE, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Painting-Booth Apparatus, of which the following is a specification.

This application is a continuation in part of my prior application filed September 23', 1915, Serial No. 52,139, which discloses a pneumatic coating apparatus comprising an air brush for applying the paint, a booth to receive the article being coated, and means for exhausting air and vapor from said booth.

The present invention relates to such a booth apparatus and air-exhausting means.

Some of the objects of the invention are to provide a booth which is open at its forward vertical side to receive the article to be painted or coated and to give the operator or painter free access to the article in the booth while painting it; which is provided with outwardly swinging hinged side sections and a specially supported roof section so that the front end of the booth may be enlarged when desired; which has transparent sections to permit ample light to reach the article being coated; which is rearwardly tapered or funnel shaped so as to eliminate pockets and attain the maximum efficiency in draft through the booth; which is provided with means for condensing or collecting certain components of the paint vapor; and which is equipped with a novel arrangement of an exhaust conduit and a motor-driven fan communicating with the tapered rear portion of the booth for exhausting air and vapor from the booth.

Another object is toprovide a booth which is made in panels or sections of such character that the booth may be packed or crated for shipment in a compact condition and may be readily set up by the user.

Another object is to improve the constru tion and relationship of the air exhausting means and the booth 'witha view to obtaining maximum efliciency in the draft of air, while eliminating danger of damage to the electric motor by reason of the varnish or paint constituents of the current of vapor, and also practically eliminating t-h fire hazard due to ignition of the inflammable vapors by sparks from the motor.

'Another object is to provide improved Specification of Letters Patent.

Patented June e. 1922. 1917. Serial No. 178,526.

means for supporting and turning the article be ng coated, and ya novel relation between said means and the air exhaust means.

A further object of the invention is to produce an improved plural booth construction and exhaust means therefor which is arranged to accommodate two or more workmen.

The invention also refers to certain details of construction, to the manner in which the sections of the booth are arranged and connected, and to certain advantages all of which will be fully pointed outin the following detailed vdescription.

In the accompanying drawings, Figure 1 is a plan view, with parts in section, illustrating a painting booth apparatus embodying the features of my invention, a twin booth arrangement being illustrated in this figure. Fig. 2 is a vertical central section from .front'to rear through a single booth and exhaust means therefor. Fig. 3 is a front elevation of a booth as seen from the left-handend of Fig. 1. Fig. 4 is a fragmental elevational view similar to Fig. 3, but taken behind the paint condensing or 001- lecting means. Figs 5 and 6 are respectively plan and elevational detail views of the means for rotating the work-support. Fig. 7 is a vertical sectional view of said support. Fig. 8 is a vertical detail section on line 88 of Fig. 2. Fig. 9 is a horizontaldetail section on line 9-9 of Fig. 2. Fig. 10 is an enlarged detail elevation illustrating the manner of association ofone of the hinged side sections and the roof structure. Fig. 11 is an elevation of the right-hand end of Fig. 10. Figs. .12 and 13 are sectional details on lines 1212 and 1313, respectively, of F ig. 1. Fig. 14 is a sectional detail of a joint between two of the booth sections.

The booth is open at its front vertical side through which an article to be coated may be moved into the booth and which open side is preferablyhigh enough to permit a man to stand therein. The booth is of sectional construction and comprises a top or roof section 15 which is of upwardly arched form, a floor section 16, two vertical side sec.- tions 17, and a converging or tapering rear portion which will be presently. described. The roof section 15 comprises a framework preferably consisting of angle irons. and filled with sheet metal at the end portions and with a glass panel 18. at the mid-portion of said roof section. The side sections 17 comprise angle iron frames, the lower portions of which are filled with sheet metal and the upper portions of which are closed by transparent sections 19. The transparent sections of the sides and roof allow ample li ht to reach the article in the booth.

In order to accommodate exceptionally large articles, it is desirable that the forward portion of a booth be capable of enlargement and this result is accomplished by mounting the side sections 17 to swing outward beyond their normal position on hinges at their rear edges, and by supporting the roof section independently of said side sections to allow swinging of the latter and to dispense with any upright supports at the forward corners of said roof section which supports would be in the way and would nullify the advantage gained by mounting the side sections to swing. The forward edges of the rear portion of the booth are provided with reinforcing bars 20 and the frames of the vertical side sections are attached by hinges 21 thereto. The rear edge of the roof section is attached to such reinforcing bars and the roof section is further supported by means of diagonal braces 22 located at the ends of the roof section. The latter is thus supported wholly from the rear portion of the booth and the side sec-ions may be swung outwardly to any desired position.

The rear portion of the booth is of sectional or panel construction and preferably comprises two flat side panels 23, a flat bottom panel 24 and an arched top panel 25, each of said panels having side edges which converge rearwardly so that when all of said side edges are joined. the result is to form a chamber which converges or tapers rearwardly. Preferably the roof section 15 slopes downwardly and rearwardly also. The joining edges of the panels are provided with complementary ton ues and grooves 26, 27, as shown most clear y in Fig. I

13. which interengage to provide tight and rigid joints. I

At the rear end of the booth is a flaring case or chamber 28. the forward edges of which overlap the rear edges of the panels 23, 24, 25 and are suitably secured thereto. This rear chamber 28 has acircular opening 29 which is defined by a ring 29 located in one of the sides. of the chamber which in the present instance is perpendicular to the front or inlet side. As seen in Fig. 1, a conduit 30 receives at one end the projecting edge of the ring 29 in the manner of a, stove pipe joint and this conduit extends to a point outside of the building. As

, indicated by way of example in Fig. 1, this conduit passes out through a window in the wall 31 of the building, and the end of the conduit is turned downwardly to eliminate or minimize back draft through the conduit. The conduit extends in a direction approximately parallel to the open front side of the booth.

@in account of its being composed of sec-' tions or panels the booth may be shipped in knocked-down condition in a very compact bundle. The arched roof section 15 when inverted provides a container into which many of the other individual sections may he piled. The sections may be easily handled and assembled by the user.

The means for creating an exhaust current from the booth and through said conduit comprises a fan 32 fixed upon a shaft 33 which may constitute an extension of the armature shaft of an electric motor 34 which drives the fan. In view of the fact that the air and vapor which. are drawn from the booth and pass through thefan may be laden with paint constituents which would damage the electric motor and would tend to injure the bearings. and also for the purpose of eliminating the fire hazard due to the infianimability of the paint vapor. I have provided a special construction of and relationship between the booth. conduit and chamber 28 on the one hand. and the fan and motor on the other. The fan is of the axial thrust type, that is to say, it is constructed to draw the air and. vapor axially through the fan and also to force the air and vapor axially away from the fan. The

fan is devoid of recesses or pockets in which condensed paint vapors might accumulate, and if the surface of the fan becomes coated it may be very easily cleaned by reason of its smooth contour. The motor 34 is located outside of the casing or chamber 28, and while the fan may be located either in the inlet to or the exhaust from chamber 28, it is herein shown. and in practice is preferably situated. in the outlet opening 29'. In the present instance the motor is located immediately outside of the wall of the chamber which is perpendicular to the front or inlet side and is opposite to the wall having the outlet opening 29 therein, said outlet opening and the motor being coaxially positioned. The motor is supported upon a pedestal 55 which in the present instance comprises two telescoping sections clamped by a set screw 56. The side of the boothsection adjacent to the motor is closed ex cept for a small opening, and the motor 34 is provided with a special bearing 34* of exceptionally long dimension which bearing projects through the opening in the wall of the booth section and extends a considerable distance into said section, so that the armature shaft has a firm bearing close up to the point where the fan 32 is mounted. Said fan is located in the outlet opening 29 or in the conduit 30, the shaft 33 extending entirely through the booth section 28. The

bearing 34 fits snugly in its opening in the is herein shown as having a single central boothwall, so that the motor is tected from the injurious effect vapor. The bearing is sufficiently tight and so constructed at its inner end that it is not injured by such vapor.

The article to be coated is supported upon a table which is rotatably mounted upon entirely proa base 36 preferably by means of a stem 37 fixed-to the table and having a ball-.

thrust bearing 38 at the lower end of a main tubular bearing 39 in the base. To the stem 37 is fixed a sheave 40 of large diameter and the table is arranged to be rotated by a belt 41 passing around this sheave and around a small sheave 42 fixed upon the 7 fan shaft 33 at the end of the extended bearing 34 and within the booth section 28. The two runs of the belt pass vertically though a hole 43 in the lower wall of'the booth and pass horizontally hole 44 and between said holes the two runs of the belt pass around idler sheaves 45 which are mounted ina bracket 46 fixed to the outer lower sideof the booth section 28. The idler sheaves 45 are arranged in. converging position on account of the large diameter of the table sheave 40 as compared with the driving sheave 42 on the fan shaft. The table is thus rotated quite slowly and the article resting thereon is turned to bring all parts thereof into position to be painted.

In Fig. 1 there is illustrated an apparatus of twin construction in which two booths are 4 located back to back and in which the section correspondingto the rearmost section 28 of the single booth is made of duplex form open at both ends and joined to the rearmost or smallestQends of the respective booths. A single conduit leads from this duplex section and the relationship of the motor and fan to said section and theconduit is the same as before described. By this construction two men may work in their respective booths and the vapor and air will be drawn therefrom by. a single exhaust means. If only one ofthe booths is being used, the'exit from-the other one may be closed by means of a slide 4'7 mounted in the rearof, the booth. v

For the purposef'of condensing or collecting a portionof the vaporized paint or more particularly the non-volatile elements thereof, I have provided bafiie means located in the rear portion of the booth againstwhich the vapor laden air will strike on its'way to the exhaustconduit and before reaching the fan and bearingtherefor. In the preferred form. herein shown, this bafiie means comprises an apertured front plate 48 which opening 49 therethrough and a rear plate 50 positioned directly behind thesaid opening Both plates are prefer in the front plate.

spouts 51 or the 11ke at ably provided with of the paint through another hausting air from the booth. -4. In an apparatus of consisting of a plurality their lower ends so as to direct the-condensed paint into a suitable receptacle 52.

side sections, a rear portion consisting of' a plurality of sections having rearwardly converging edges secured together to provide a rearwardly tapering portion of the booth, said sections being constructed in separate units which are arranged to be piled in a compact bundle for transportation orstorageand to be readily secured ogether by the user in assembling the booth, and exhaust means including a conduit communicating with said rear tapering portion.

2. In an apparatus'of the character described, a booth open at its forward side and comprising a plurality of separable sections arranged when knocked down to be piled in a compact bundle for transportation or storage, the booth comprising a top section, two sides, a rear por ion whichconverges or tapers rearwardly, said rear portion being composed of a bottom section, two side sections and a top section, each of which has its edges converging rearwardly, the said converging edges of said sections being secured together, and conduit means communicating with the smaller 'rear end of said tapering portion. I

An apparatus of the character described comprising, in combination, a booth open at its front vertical side to receive an article to be coated and to give access to said article by the operator, said booth 7 comprising an upwardly arched top wall, two vertical sides and a rear portion which converges rearwardly'and merges into the planes of said top wall and sides, the booth being constructed of a plurality of separable-sections arranged when knocked down to be piled in said upwardly arched top wall in a compact bundle for transportation or storage, .a conduit attached to the rearmost and smallest portion of said rear section, and means associated with said conduit for exthe character decomprlsing a top and a rear'portion scribed, a sectional booth section, two side sections,

'rearwardly converging edges secured together to provide a rearwardly tapering tion of the booth, one-of said side sections being arranged-to be moved outwardly to enlarge the booth and theadjacent end'of said top section being supported directly of sections having j porfrom said rear portion independently of the said movable side section.

5. In an apparatus of the character described, a booth adapted to receive an article to be coated and having an open front side, said booth comprising an upwardly bowed top wall, a rearwardly converging rear closure, reinforcing bars secured to the edges of said top wall and rear closure, diagonal braces connecting said reinforcing bars for supporting the top wall, and outwardly swinging side wall sections hinged at their rear edges to the side edges of said rear closure, said side wall sections and top wall having transparent sections therein.

6. In an apparatus of the character described, a booth adapted to receive an article to be coatedand having an open frontside, a top wall, and rear closure means, reinforcing bars at the edges of said top wall and said rear closure means, a swinging side wall section hinged along its vertical rear edge to swing outwardly, and diagonal brace means connectin the reinforcing bars for said top wall an rear closure means and arranged to support the. top wall independently of said swinging section.

7. An apparatus of the character described comprising in combination, two booths open at their front sides and positioned back to back, a single conduit communicating with the rear sides of both of said booths, and air current creating means associated with said conduit.

8. An apparatus of the character described comprising, in combination, two booths open at their front sides and positioned back to back, a single conduit com munieating with both of said booths, air current creating means associated with said conduit, and means for cutting off communication between one of said booths and said conduit.

9. An apparatus of the character described comprising, in combination, a booth adapted to receive an article to be coated, a chamber communicating with said booth, a motor located outside of said chamber and booth, the motor comprising a long bearing and a shaft therein, both of which project a substantial distance into said chamber, and a fan fixed upon said shaft in position to draw air from the chamber.

10. An apparatus of the character described comprising, in combination, a booth of rearwardly converging shape, a chamber having an, open side communicating with the booth and having walls approximately perpendicular to said open side, one of which walls has an outlet therethrough and the other of which walls has an opening therein, a conduit leading from said outlet, a motor positioned outside of the opposed wall, the driving shaft of said motor extending through said chamber, a fan fixed on said shaft within said outlet or conduit, and a long bearing on the motor within which said shaft is mounted, said bearing passing through Said opening in the wall adjacent to the motor and projecting into the chamber to a point relatively close to the fan.

11. An apparatus of the character described comprising, in combination, a chamber having an inlet at one side and an outlet in a side approximately perpendicular to the inlet side, a fan locate-d concentric with and adjacent to said outlet, a motor located outside of said chamber adjacent to the wall directly opposite said outlet,said motor having a shaft projecting through the chamber on the free end of which shaft said fan is fixed, and a bearing on the motor projecting through the adjacent wall of the chamber and being of long dimension to support the said shaft at a point close to the fan.

12. An apparatus of the character described comprising, in combination, a chamber having an outlet in one wall, a motor located outside of said chamber adjacent to the wall opposite to the first-mentioned wall, a shaft driven by said motor and passing through the chamber in a position approximately coaxial with said outlet, and a fan fixed on the free end of said shaft adjacent to said outlet, said chamber having an inlet arranged to permit air to flow into the chamber between said fan and the motor.

1 3. An apparatus of the character descrlbed comprisin in combination, a booth having an open ront side and being rearwardl'y tapered, an exhaust conduit communicating with the rear end of said tapered portion, a fan arranged to draw air from the booth and force it through said conduit, a motor located adjacent to but outside of the booth and coaxial with said fan, the motor having a shaft projecting into the path of theair current and on which shaft said fan is fixed, a sheave fixed on said shaft, a belt running over said sheave, a pair of idler sheaves. over which the runs of said belt pass, a rotary table in the booth adapted to support an article to be coated, and a sheave fixed to said table around which sheave said belt passes.

14. An apparatus of the character described comprising, in combination, a booth, a horizontallydisposed rotary table therein upon which an article to be coated may be mounted, an exhaust conduit communicating with said booth, a fan for exhausting air from the booth through said conduit, a motor arranged to drive said fan, and a driving connection between the motor and said table for rotating the latter on a vertical axis.

15. An apparatus of the character described comprising, in combination, a booth, a rotary support upon which an article to be coated may be mounted, an exhaust con- 15 duit communicating with said booth, a fan for exhausting air from the booth through said conduit, a motor arranged to drive said fan, a sheave on the fan shaft, a sheave fixed to said rotary support, and a belt passing around said sheaves for turning said sup-, port.

16. An apparatus of the character described comprising, in combination, a booth adapted to receive an article to be coated, means for drawing off air and vapor from said booth, 'and baiile plates mounted in the booth and in the path of the air flowing toward said drawing off means, said plates comprising a front plate having a central aperture and an imperforate rear plate, positioned behind the aperture in the front plate, said plates being shaped at their lower portions, to conduct the condensed paint into a receptacle.

17. in an apparatus of the class described, a chamber, one wall of said chamber being open, means for exhausting air through the .open wall of said chamber, said chamber having lateral openings at either side of said discharge opening, and means, for closing either lateral opening.

18. In an apparatus of the class described, two painting booths each comprising a body portion and a tapering exit portion, said booths being arranged with the small ends of their exit portions adjacent, a discharge chamber communicating with the exit portions of both booths, and means for exhausting air from. said discharge chamber.

v 19. An apparatus of the class described having, in combination, two painting booths arranged on opposite sides of a discharge chamber, said discharge chamber having opposed openings communicating directly with,

said opposed painting booths,means for closlng either opening and means for exhaustingair from said discharge chamber.

20. An apparatus of the class described having, in combination, two painting booths arranged on opposite sides of a discharge chamber, said discharge chamber having opposed openings communicating directly with said opposed painting booths, a discharge tube communicating with a lateral opening in said chamber and a discharge'fan located in said opening.

21. An apparatus of the class described having, in combination, two painting booths arranged on opposite sides of a discharge chamber, said discharge chamber having opposed openings communicating directly with said opposed painting booths, a discharge tube communicating with a lateral opening in said chamlber, a discharge fan located said opening, an electric motor outside saidchamber on the opposite side thereof from said discharge fan, ashaft extending from said motor to drive said fan, and a bearing completely enclosing and protecting sald opening of the chamber, a motor outside said chamber opposite one of the openings in said chamber, an exhaust fan of the axial thrust type located in the opening opposite said motor, and. a connection extending-into the chamber for driving said fan by means of said motor.

-23. An apparatus of the character described comprising, in combination, a booth adapted to receive an article to be coated, a chamber having inlet and exhaust openings, said booth communicating with the inlet opening of the chamber, a motor outside said chamber diametrically opposite one of the openings in said chamber, an exhaust fan of the axial thrust type located in the opening opposite said motor, and a connection extending through the wall of the chamber opposite said opening for driving said'fan by means of said motor.

24. An apparatus of the character described comprising, in combination, a booth adapted to receive an article to be coated, a

said booth communicating with the inlet opening of the chamber, an exhaust fan of the axial thrust type located in one of the openings in said chamber, a motor outside the chamber, and a connection extending into the chamber for driving said fan by means of said motor.

' 25. An apparatus of the character described comprising, in combination, a booth adapted to receive an article to be coated, a chamber having inlet and exhaust openings, said booth communicating with the inlet opening of the chamber, an exhaust fan of the axial thrust type, a motor, and a connection for driving said fan from said motor, a

nections for driving said fan from said motor.

27. An apparatus of thecharacter described comprising, in combination, aibooth having its front side open for the reception of an article to be coated, said booth having a rearwardly tapered portion opposite the open side, a chamber at the small end of said tapered portion having inlet and exhaust openings located in approximately right angular relation to each other, the inlet opening of said chamber communicating with the rear end of said tapered portion of the booth, an exhaust fan of the axial thrust type located substantially coaxial with and adjacent to one of said openings, a shaft on the inner end of which said fan is fixed, said shaft extending through said chamber and through the wall of the chamber at a point located opposite to and coaxial with said fan, and a motor fixed on the outer end of said shaft for driving the shaft and the fan.

28. An apparatus of the character described comprising, in combination, a chamher having inlet and exhaust openings located out of alinement with each other Whereby the air current through said chamber will flow in ancangular or curved path, an ex haust fan of the axial thrusttype located in one of said openings, a shaft on the inner end of which said fan is fixed, said shaft extending through said chamber and through the wall of said chamber located axiallyopposite said fan, and a motor located outside of said chamber coaxial with said shaft for drivin the shaft and the fan.

29. in apparatus of the character described comprising, in combination, a rotary shaft having fixed on one end a fan of the axial thrust type and having at its other end a motor for driving the shaft and the fan, a chamber having inlet and exhaust openings in one of which said fan is located, said openings being relatively positioned to cause the air current induced by said fan to flow in an angular or curved path through the space between the fan and the motor, said motor being located outside of said chamber.

In testimony'whereof, I have hereunto set 40 my hand.

JENS A. PAASOHE. 

